Disconnected or damaged washer fluid level sensor connector; Broken, chafed, or corroded wiring in the sensor control circuit; Failed washer fluid level sensor; Blown fuse or poor ground connection for the sensor circuit; Faulty body control module (BCM) driver circuit; Contamination or debris on the sensor causing incorrect resistance

DTC codes / B01xx · Airbags, seats, doors, lights and comfort systems / B012F

B012FA/V Sensor Washer Fluid A Control Circuit

Q: What does code B012F mean?

A/V Sensor Washer Fluid A Control Circuit. B012F indicates that the body control module (BCM) has detected a fault in the control circuit for the washer fluid level sensor, often referred to as the A/V sensor washer fluid A circuit. The computer monitors the expected voltage or signal on the control wire and sets this code when the circuit is open, shorted, or out of normal range.

B012F indicates that the body control module (BCM) has detected a fault in the control circuit for the washer fluid level sensor, often referred to as the A/V sensor washer fluid A circuit. The computer monitors the expected voltage or signal on the control wire and sets this code when the circuit is open, shorted, or out of normal range.

SystemBody

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaAirbags, seats, doors, lights and comfort systems

Symptoms you may notice

Washer fluid low warning light stays on even when the reservoir is full
Washer fluid level gauge or indicator reads incorrectly or not at all
Often no symptoms besides the warning light
Intermittent or flickering washer fluid warning
Other body control functions like wipers or washers may work normally
No noticeable effect on engine performance or drivability

Common causes, most likely first

Disconnected or damaged washer fluid level sensor connector
Broken, chafed, or corroded wiring in the sensor control circuit
Failed washer fluid level sensor
Blown fuse or poor ground connection for the sensor circuit
Faulty body control module (BCM) driver circuit
Contamination or debris on the sensor causing incorrect resistance

How to diagnose and fix it

Check the washer fluid level and top off if low; verify the sensor is not stuck
Inspect the sensor connector and wiring for damage, corrosion, or loose pins
Test the sensor resistance or signal output according to the manufacturer's specification
Check for power and ground at the sensor connector with a multimeter
Inspect the BCM connectors and wiring for signs of water intrusion or corrosion
Clear the code and test drive to see if it returns; if it does, perform a wiggle test on the harness
Replace the washer fluid level sensor if faulty, then recheck the circuit

Washer fluid sensor circuit quirks

A common oversight is assuming the sensor is bad when the real problem is a corroded connector behind the inner fender, often caused by road splash.
The BCM may set this code only after a self-test cycle, so the warning light can appear intermittently and mislead diagnosis.
Aftermarket washer fluid with conductive additives can coat the sensor and alter its resistance, triggering the code without any hard failure.
The code does not always mean the sensor is faulty; a short to ground in the harness can mimic a failed sensor and damage the BCM if not corrected.
On some vehicles, the washer fluid level sensor shares a ground with other body sensors, so a bad ground can set multiple unrelated codes.

Can I keep driving with B012F?

This code does not affect engine operation or safety, so you can continue driving. However, avoid relying on the washer fluid warning and check the fluid level manually until the fault is repaired.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.